Telescope.



No. 695,7!2. Patented Mar. l8. I902.

G. FECKER.

TELESCOPE.

(Application filed July 5, 1901.) (No Model 1 712/672 'k. "4016;5666'. &

UNITED STATES PATENT OFFICE.

GOTTLIEB FEOKER, OF CLEVELAND, OHIO, ASSIGNOR TO THE \VARNER &

' SIVASEY COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

TELESCOPE.

SPECIFICATION forming part of Letters Patent No. 695,712, dated March 18, 1902.

Application filed July 5, 1901. Serial No. 67,121. (No model.)

T0 (0 whom it 72mg concern:

Be it known that I, GOTTLIEB Fnoxnn, a citizen of the United States, residing at Oleveland, in the county of Ouyahoga and State of Ohio, have invented a certain new and useful Improvement in Telescopes, of which the following is a full, clear, and exact description,reference being had to the accompanying drawings.

The invention relates to improvements in the kind of telescopes which employ the socalled Porro prisms.

The object of the invention is to firmly hold such prisms in the barrel against the seats therefor provided and to effect this result by means which are exceedingly simple in construction, but which may be easily manipulated either for the purpose of fastening the prisms in place or for releasing them whereby they may be removed.

The invention consists in the construction and combination of parts hereinafter described, and pointed out in the claims.

In the drawings, Figure 1 is an end view of a telescope-tube containing myinvention. Fig. 2 is a side elevation, partly in section, on line 2 2 of Fig. 1; and Fig. 3 is aseetional View on line 3 3 of Fig. l of a portion of said tube, 85c.

Referring to the parts by letters, A represents a triple-tube barrel, which may be of any specific form adapted to receive and utilize the so-called Porro prisms. The specific barrel shown is one of a pair of barrels used in a prism binocular-glass. These barrels contain three tubes 1 2 3, which may or may not be separated by longitudinal partitions. 13 represents a prism which spans two of said tubes and whose base is held firmly against the transverse seat a, which projects inward from the walls of the barrel. The means for holding the prisms against these seats constitutes the present invention. The ends of such barrels are ordinarily closed by cap-plates secured thereto by screwsas, for example, the cap-plates E at the objective end of said barrel. In the common construction these prisms are held in place by the cap-plates. I believe it to be desirable that they be held in place by means which are wholly independent of the cap-plates,

thus allowing the instrument to be taken apart without in any way disturbing the prisms. It is also desirable that the means employed for holding the prisms be simple in construction and adapted to be easily placed and removed, but which will not be. liable to accidental displacement in the handling of the barrels. All of these ends are attained by the combinations constituting to my invention, as follows: A cross-bar a, which is preferably an integral part of the barrel, occupies a position at the end of the barrel between the two tubes 1 and 2, which the adjacent prism spans, and the third tube 3 in the barrel. On the edge of this crossbar is an overhanging flange 0 On the opposite edge of the barrel is an inwardly-extended flange (E, which for convenience is formed on the inner face of a boss a which is provided primarily for receiving one of the screws by which the cap plate is attached to the end of the barrel. A bent leafspring 0 bears near its middle point on the flat top of the prism, while its ends lie respec- 7 5 tively beneath said flanges (t (F, the spring being nnderconsiderable tension when in this position, whereby the prism is pressed firmly against its seat. In the best construction, as shown, the flange a is formed by cutting a horizontal and preferably arc-shaped kerf or groove a in said boss a. The ends of this spring are preferably also arc-shaped. To place the spring so that it will perform its functions, one end thereof is inserted in this kerf, while the other or free end of the spring is at one side of the flange a the middle part of the spring bearing at this time on the flat top of the prism. The free end of the spring is then bent down below the level of the flange a and is moved beneath said flange, the other end of the spring turning in the kerf as on a pivot. In order to prevent accidental displacement of this spring, a notch a is formed in the under side of the flange c and when 5 the free end of the spring has been turned far enough it flies up into this notch, whereby further movement of this end of the spring in either direction is prevented until said end is first pressed down out of said notch.

The drawings show in detail the mechanism at one end only of the barrel. It will be IOU understood, however,by persons familiar with this art that another prism is secured nearer the opposite end of the barrel spanning the tubes 1 and 3. The means for so securingit may be precisely like those heretofore described.

Having described my invention, I claim 1. In a Porro-prism telescope, the combinationof a triple-tube barrel having a transverse seat for the base of the prism, a crossbar near the end of the barrel, and two inbarrel and on the cross-bar respectively, a

kerf a and an inwardly-turned flange a in which is a notch 0, with a prism resting upon said seat and a bent leaf-spring whose middle part bears upon the top of the prism and whose ends when the spring is in place engage in said kerf and notch respectively, substantially as described.

3. In a Porro-prism telescope, the combination of the barrel having an internal transverse seat for the base of the prism, and two inwardly-extended shoulders outside of said base, with a prism whose base rests upon said seat, and a bent leaf-spring, which, between its ends, bears upon the top of the prism, and whose ends engage beneath said shoulders, substantially as described.

In testimony whereof I hereunto affix my signature in the presence of two Witnesses. GOTTLIEB FEOKER.

Witnesses:

WM. E. REED, JOHN WEBER. 

